61836930891 has 72 divisors (see below), whose sum is σ = 95999514000. Its totient is φ = 38346255360.

The previous prime is 61836930847. The next prime is 61836930929. The reversal of 61836930891 is 19803963816.

It is not a de Polignac number, because 61836930891 - 2¹¹ = 61836928843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61836930191) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 146880861 + ... + 146881281.

Almost surely, 2^61836930891 is an apocalyptic number.

61836930891 is a deficient number, since it is larger than the sum of its proper divisors (34162583109).

61836930891 is a wasteful number, since it uses less digits than its factorization.

61836930891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989 (or 969 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The spelling of 61836930891 in words is "sixty-one billion, eight hundred thirty-six million, nine hundred thirty thousand, eight hundred ninety-one".