61562991678 has 32 divisors (see below), whose sum is σ = 127391335200. Its totient is φ = 19810323456.

The previous prime is 61562991629. The next prime is 61562991691. The reversal of 61562991678 is 87619926516.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1286550 + ... + 1333542.

It is an arithmetic number, because the mean of its divisors is an integer number (3980979225).

Almost surely, 2^61562991678 is an apocalyptic number.

61562991678 is an abundant number, since it is smaller than the sum of its proper divisors (65828343522).

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

61562991678 is a wasteful number, since it uses less digits than its factorization.

61562991678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54556.

The product of its digits is 9797760, while the sum is 60.

The spelling of 61562991678 in words is "sixty-one billion, five hundred sixty-two million, nine hundred ninety-one thousand, six hundred seventy-eight".