402493366491 has 16 divisors (see below), whose sum is σ = 540205215360. Its totient is φ = 266556769920.

The previous prime is 402493366427. The next prime is 402493366591. The reversal of 402493366491 is 194663394204.

It is not a de Polignac number, because 402493366491 - 2⁶ = 402493366427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (402493366291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 847776 + ... + 1234386.

It is an arithmetic number, because the mean of its divisors is an integer number (33762825960).

Almost surely, 2^402493366491 is an apocalyptic number.

402493366491 is a deficient number, since it is larger than the sum of its proper divisors (137711848869).

402493366491 is a wasteful number, since it uses less digits than its factorization.

402493366491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388906.

The product of its (nonzero) digits is 3359232, while the sum is 51.

The spelling of 402493366491 in words is "four hundred two billion, four hundred ninety-three million, three hundred sixty-six thousand, four hundred ninety-one".