155370561 has 4 divisors (see below), whose sum is σ = 207160752. Its totient is φ = 103580372.

The previous prime is 155370557. The next prime is 155370563. The reversal of 155370561 is 165073551.

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 a cyclic number.

It is not a de Polignac number, because 155370561 - 2² = 155370557 is a prime.

It is a super-2 number, since 2×155370561² = 48280022450909442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155370563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25895091 + ... + 25895096.

It is an arithmetic number, because the mean of its divisors is an integer number (51790188).

Almost surely, 2^155370561 is an apocalyptic number.

It is an amenable number.

155370561 is a deficient number, since it is larger than the sum of its proper divisors (51790191).

155370561 is an equidigital number, since it uses as much as digits as its factorization.

155370561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51790190.

The product of its (nonzero) digits is 15750, while the sum is 33.

The square root of 155370561 is about 12464.7728017802. The cubic root of 155370561 is about 537.5962673075.

The spelling of 155370561 in words is "one hundred fifty-five million, three hundred seventy thousand, five hundred sixty-one".