20401161637 has 2 divisors, whose sum is σ = 20401161638. Its totient is φ = 20401161636.

The previous prime is 20401161629. The next prime is 20401161673. The reversal of 20401161637 is 73616110402.

Together with next prime (20401161673) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20392125601 + 9036036 = 142801^2 + 3006^2 .

It is a cyclic number.

It is not a de Polignac number, because 20401161637 - 2³ = 20401161629 is a prime.

It is a super-2 number, since 2×20401161637² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20401161599 and 20401161608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20401162637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200580818 + 10200580819.

It is an arithmetic number, because the mean of its divisors is an integer number (10200580819).

Almost surely, 2^20401161637 is an apocalyptic number.

It is an amenable number.

20401161637 is a deficient number, since it is larger than the sum of its proper divisors (1).

20401161637 is an equidigital number, since it uses as much as digits as its factorization.

20401161637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The spelling of 20401161637 in words is "twenty billion, four hundred one million, one hundred sixty-one thousand, six hundred thirty-seven".