155980074997 has 2 divisors, whose sum is σ = 155980074998. Its totient is φ = 155980074996.

The previous prime is 155980074841. The next prime is 155980075019. The reversal of 155980074997 is 799470089551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126173433681 + 29806641316 = 355209^2 + 172646^2 .

It is a cyclic number.

It is not a de Polignac number, because 155980074997 - 2²³ = 155971686389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155980024997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77990037498 + 77990037499.

It is an arithmetic number, because the mean of its divisors is an integer number (77990037499).

Almost surely, 2^155980074997 is an apocalyptic number.

It is an amenable number.

155980074997 is a deficient number, since it is larger than the sum of its proper divisors (1).

155980074997 is an equidigital number, since it uses as much as digits as its factorization.

155980074997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28576800, while the sum is 64.

The spelling of 155980074997 in words is "one hundred fifty-five billion, nine hundred eighty million, seventy-four thousand, nine hundred ninety-seven".