402059643981 has 16 divisors (see below), whose sum is σ = 568106846208. Its totient is φ = 252053504000.

The previous prime is 402059643961. The next prime is 402059643989. The reversal of 402059643981 is 189346950204.

It is a cyclic number.

It is not a de Polignac number, because 402059643981 - 2²³ = 402051255373 is a prime.

It is a super-2 number, since 2×402059643981² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402059643989) 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, 3365940 + ... + 3483341.

It is an arithmetic number, because the mean of its divisors is an integer number (35506677888).

Almost surely, 2^402059643981 is an apocalyptic number.

It is an amenable number.

402059643981 is a deficient number, since it is larger than the sum of its proper divisors (166047202227).

402059643981 is a wasteful number, since it uses less digits than its factorization.

402059643981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6850452.

The product of its (nonzero) digits is 1866240, while the sum is 51.

The spelling of 402059643981 in words is "four hundred two billion, fifty-nine million, six hundred forty-three thousand, nine hundred eighty-one".