61642364838 has 16 divisors (see below), whose sum is σ = 123292047216. Its totient is φ = 20546235360.

The previous prime is 61642364827. The next prime is 61642364851. The reversal of 61642364838 is 83846324616.

It is a happy number.

It is a super-2 number, since 2×61642364838² (a number of 22 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 7 ways as a sum of consecutive naturals, for example, 192181 + ... + 400272.

It is an arithmetic number, because the mean of its divisors is an integer number (7705752951).

Almost surely, 2^61642364838 is an apocalyptic number.

61642364838 is an abundant number, since it is smaller than the sum of its proper divisors (61649682378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61642364838 is a wasteful number, since it uses less digits than its factorization.

61642364838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609799.

The product of its digits is 3981312, while the sum is 51.

The spelling of 61642364838 in words is "sixty-one billion, six hundred forty-two million, three hundred sixty-four thousand, eight hundred thirty-eight".