155057220971 has 2 divisors, whose sum is σ = 155057220972. Its totient is φ = 155057220970.

The previous prime is 155057220959. The next prime is 155057221013. The reversal of 155057220971 is 179022750551.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155057220971 is a prime.

It is not a weakly prime, because it can be changed into another prime (155057220911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77528610485 + 77528610486.

It is an arithmetic number, because the mean of its divisors is an integer number (77528610486).

Almost surely, 2^155057220971 is an apocalyptic number.

155057220971 is a deficient number, since it is larger than the sum of its proper divisors (1).

155057220971 is an equidigital number, since it uses as much as digits as its factorization.

155057220971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 220500, while the sum is 44.

The spelling of 155057220971 in words is "one hundred fifty-five billion, fifty-seven million, two hundred twenty thousand, nine hundred seventy-one".