20151656377 has 2 divisors, whose sum is σ = 20151656378. Its totient is φ = 20151656376.

The previous prime is 20151656321. The next prime is 20151656407. The reversal of 20151656377 is 77365615102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19211068816 + 940587561 = 138604^2 + 30669^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20151656377 is a prime.

It is a super-2 number, since 2×20151656377² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20151656477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10075828188 + 10075828189.

It is an arithmetic number, because the mean of its divisors is an integer number (10075828189).

Almost surely, 2^20151656377 is an apocalyptic number.

It is an amenable number.

20151656377 is a deficient number, since it is larger than the sum of its proper divisors (1).

20151656377 is an equidigital number, since it uses as much as digits as its factorization.

20151656377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 264600, while the sum is 43.

The spelling of 20151656377 in words is "twenty billion, one hundred fifty-one million, six hundred fifty-six thousand, three hundred seventy-seven".