61881398377 has 4 divisors (see below), whose sum is σ = 61926667776. Its totient is φ = 61836128980.

The previous prime is 61881398339. The next prime is 61881398569. The reversal of 61881398377 is 77389318816.

61881398377 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61881398377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61881318377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22632649 + ... + 22635382.

It is an arithmetic number, because the mean of its divisors is an integer number (15481666944).

Almost surely, 2^61881398377 is an apocalyptic number.

It is an amenable number.

61881398377 is a deficient number, since it is larger than the sum of its proper divisors (45269399).

61881398377 is a wasteful number, since it uses less digits than its factorization.

61881398377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45269398.

The product of its digits is 12192768, while the sum is 61.

The spelling of 61881398377 in words is "sixty-one billion, eight hundred eighty-one million, three hundred ninety-eight thousand, three hundred seventy-seven".