157019977 has 2 divisors, whose sum is σ = 157019978. Its totient is φ = 157019976.

The previous prime is 157019923. The next prime is 157019987. The reversal of 157019977 is 779910751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130507776 + 26512201 = 11424^2 + 5149^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157019977 is a prime.

It is not a weakly prime, because it can be changed into another prime (157019987) 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, 78509988 + 78509989.

It is an arithmetic number, because the mean of its divisors is an integer number (78509989).

Almost surely, 2^157019977 is an apocalyptic number.

It is an amenable number.

157019977 is a deficient number, since it is larger than the sum of its proper divisors (1).

157019977 is an equidigital number, since it uses as much as digits as its factorization.

157019977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138915, while the sum is 46.

The square root of 157019977 is about 12530.7612298695. The cubic root of 157019977 is about 539.4919512886.

The spelling of 157019977 in words is "one hundred fifty-seven million, nineteen thousand, nine hundred seventy-seven".