155961370923 has 4 divisors (see below), whose sum is σ = 207948494568. Its totient is φ = 103974247280.

The previous prime is 155961370921. The next prime is 155961370937. The reversal of 155961370923 is 329073169551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155961370923 - 2¹ = 155961370921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155961370921) 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, 25993561818 + ... + 25993561823.

It is an arithmetic number, because the mean of its divisors is an integer number (51987123642).

Almost surely, 2^155961370923 is an apocalyptic number.

155961370923 is a deficient number, since it is larger than the sum of its proper divisors (51987123645).

155961370923 is an equidigital number, since it uses as much as digits as its factorization.

155961370923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51987123644.

The product of its (nonzero) digits is 1530900, while the sum is 51.

The spelling of 155961370923 in words is "one hundred fifty-five billion, nine hundred sixty-one million, three hundred seventy thousand, nine hundred twenty-three".