1661299007 has 8 divisors (see below), whose sum is σ = 1759455936. Its totient is φ = 1563190272.

The previous prime is 1661298941. The next prime is 1661299043. The reversal of 1661299007 is 7009921661.

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 1661299007 - 2²⁸ = 1392863551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661299807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78383 + ... + 97295.

It is an arithmetic number, because the mean of its divisors is an integer number (219931992).

Almost surely, 2^1661299007 is an apocalyptic number.

1661299007 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1661299007 is a deficient number, since it is larger than the sum of its proper divisors (98156929).

1661299007 is a wasteful number, since it uses less digits than its factorization.

1661299007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24097.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 1661299007 is about 40759.0358938972. The cubic root of 1661299007 is about 1184.3569197928.

The spelling of 1661299007 in words is "one billion, six hundred sixty-one million, two hundred ninety-nine thousand, seven".