20616631157 has 2 divisors, whose sum is σ = 20616631158. Its totient is φ = 20616631156.

The previous prime is 20616631151. The next prime is 20616631219. The reversal of 20616631157 is 75113661602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12006461476 + 8610169681 = 109574^2 + 92791^2 .

It is a cyclic number.

It is not a de Polignac number, because 20616631157 - 2⁸ = 20616630901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20616631157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20616631151) 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, 10308315578 + 10308315579.

It is an arithmetic number, because the mean of its divisors is an integer number (10308315579).

Almost surely, 2^20616631157 is an apocalyptic number.

It is an amenable number.

20616631157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20616631157 is an equidigital number, since it uses as much as digits as its factorization.

20616631157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 38.

The spelling of 20616631157 in words is "twenty billion, six hundred sixteen million, six hundred thirty-one thousand, one hundred fifty-seven".