155660997 has 4 divisors (see below), whose sum is σ = 207548000. Its totient is φ = 103773996.

The previous prime is 155660971. The next prime is 155661001. The reversal of 155660997 is 799066551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 155660997 - 2⁶ = 155660933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155860997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25943497 + ... + 25943502.

It is an arithmetic number, because the mean of its divisors is an integer number (51887000).

Almost surely, 2^155660997 is an apocalyptic number.

It is an amenable number.

155660997 is a deficient number, since it is larger than the sum of its proper divisors (51887003).

155660997 is an equidigital number, since it uses as much as digits as its factorization.

155660997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51887002.

The product of its (nonzero) digits is 510300, while the sum is 48.

The square root of 155660997 is about 12476.4176348822. The cubic root of 155660997 is about 537.9310371198.

The spelling of 155660997 in words is "one hundred fifty-five million, six hundred sixty thousand, nine hundred ninety-seven".