1661502297 has 24 divisors (see below), whose sum is σ = 2727673536. Its totient is φ = 876041568.

The previous prime is 1661502287. The next prime is 1661502341. The reversal of 1661502297 is 7922051661.

It is not a de Polignac number, because 1661502297 - 2⁸ = 1661502041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1661502287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 672258 + ... + 674724.

It is an arithmetic number, because the mean of its divisors is an integer number (113653064).

Almost surely, 2^1661502297 is an apocalyptic number.

It is an amenable number.

1661502297 is a deficient number, since it is larger than the sum of its proper divisors (1066171239).

1661502297 is an frugal number, since it uses more digits than its factorization.

1661502297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4957 (or 2490 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 1661502297 is about 40761.5296204644. The cubic root of 1661502297 is about 1184.4052269904.

The spelling of 1661502297 in words is "one billion, six hundred sixty-one million, five hundred two thousand, two hundred ninety-seven".