31561663601401 has 16 divisors (see below), whose sum is σ = 32563030406400. Its totient is φ = 30568179385728.

The previous prime is 31561663601399. The next prime is 31561663601471. The reversal of 31561663601401 is 10410636616513.

It is a cyclic number.

It is not a de Polignac number, because 31561663601401 - 2¹ = 31561663601399 is a prime.

It is a super-2 number, since 2×31561663601401² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31561663601471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29992480 + ... + 31026958.

It is an arithmetic number, because the mean of its divisors is an integer number (2035189400400).

Almost surely, 2^{31561663601401} is an apocalyptic number.

It is an amenable number.

31561663601401 is a deficient number, since it is larger than the sum of its proper divisors (1001366804999).

31561663601401 is a wasteful number, since it uses less digits than its factorization.

31561663601401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038288.

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 31561663601401 in words is "thirty-one trillion, five hundred sixty-one billion, six hundred sixty-three million, six hundred one thousand, four hundred one".