42640644642406 has 32 divisors (see below), whose sum is σ = 64476199918080. Its totient is φ = 21149432488800.

The previous prime is 42640644642371. The next prime is 42640644642439. The reversal of 42640644642406 is 60424644604624.

It is a super-2 number, since 2×42640644642406² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135650325 + ... + 135964303.

It is an arithmetic number, because the mean of its divisors is an integer number (2014881247440).

Almost surely, 2^{42640644642406} is an apocalyptic number.

42640644642406 is a deficient number, since it is larger than the sum of its proper divisors (21835555275674).

42640644642406 is a wasteful number, since it uses less digits than its factorization.

42640644642406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315340.

The product of its (nonzero) digits is 21233664, while the sum is 52.

The spelling of 42640644642406 in words is "forty-two trillion, six hundred forty billion, six hundred forty-four million, six hundred forty-two thousand, four hundred six".