61009191438 has 32 divisors (see below), whose sum is σ = 135935604000. Its totient is φ = 18124745856.

The previous prime is 61009191427. The next prime is 61009191461. The reversal of 61009191438 is 83419190016.

It is a self number, because there is not a number n which added to its sum of digits gives 61009191438.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13483413 + ... + 13487936.

It is an arithmetic number, because the mean of its divisors is an integer number (4247987625).

Almost surely, 2^61009191438 is an apocalyptic number.

61009191438 is an abundant number, since it is smaller than the sum of its proper divisors (74926412562).

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

61009191438 is a wasteful number, since it uses less digits than its factorization.

61009191438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26971396.

The product of its (nonzero) digits is 46656, while the sum is 42.

The spelling of 61009191438 in words is "sixty-one billion, nine million, one hundred ninety-one thousand, four hundred thirty-eight".