20156900651 has 2 divisors, whose sum is σ = 20156900652. Its totient is φ = 20156900650.

The previous prime is 20156900593. The next prime is 20156900713. The reversal of 20156900651 is 15600965102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20156900651 is a prime.

It is not a weakly prime, because it can be changed into another prime (20156900251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10078450325 + 10078450326.

It is an arithmetic number, because the mean of its divisors is an integer number (10078450326).

Almost surely, 2^20156900651 is an apocalyptic number.

20156900651 is a deficient number, since it is larger than the sum of its proper divisors (1).

20156900651 is an equidigital number, since it uses as much as digits as its factorization.

20156900651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 35.

The spelling of 20156900651 in words is "twenty billion, one hundred fifty-six million, nine hundred thousand, six hundred fifty-one".