61777477716 has 48 divisors (see below), whose sum is σ = 150487400448. Its totient is φ = 19687650400.

The previous prime is 61777477631. The next prime is 61777477717.

61777477716 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 61777477716.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61777477717) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 529621 + ... + 635651.

It is an arithmetic number, because the mean of its divisors is an integer number (3135154176).

Almost surely, 2^61777477716 is an apocalyptic number.

It is an amenable number.

61777477716 is an abundant number, since it is smaller than the sum of its proper divisors (88709922732).

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

61777477716 is a wasteful number, since it uses less digits than its factorization.

61777477716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108172 (or 108170 counting only the distinct ones).

The product of its digits is 16941456, while the sum is 60.

The spelling of 61777477716 in words is "sixty-one billion, seven hundred seventy-seven million, four hundred seventy-seven thousand, seven hundred sixteen".