1660953397 has 8 divisors (see below), whose sum is σ = 1769861016. Its totient is φ = 1553290752.

The previous prime is 1660953377. The next prime is 1660953401. The reversal of 1660953397 is 7933590661.

It can be written as a sum of positive squares in 4 ways, for example, as 820765201 + 840188196 = 28649^2 + 28986^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1660953397 - 2²⁷ = 1526735669 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1660953397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660953317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308488 + ... + 313825.

It is an arithmetic number, because the mean of its divisors is an integer number (221232627).

Almost surely, 2^1660953397 is an apocalyptic number.

1660953397 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1660953397 is a deficient number, since it is larger than the sum of its proper divisors (108907619).

1660953397 is a wasteful number, since it uses less digits than its factorization.

1660953397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622487.

The product of its (nonzero) digits is 918540, while the sum is 49.

The square root of 1660953397 is about 40754.7959999802. The cubic root of 1660953397 is about 1184.2747844715.

The spelling of 1660953397 in words is "one billion, six hundred sixty million, nine hundred fifty-three thousand, three hundred ninety-seven".