61772775671720 has 32 divisors (see below), whose sum is σ = 138989924615520. Its totient is φ = 24708900605760.

The previous prime is 61772775671627. The next prime is 61772775671723. The reversal of 61772775671720 is 2717657727716.

It is a super-3 number, since 3×61772775671720³ (a number of 42 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (61772775671723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1735262 + ... + 11249741.

It is an arithmetic number, because the mean of its divisors is an integer number (4343435144235).

Almost surely, 2^{61772775671720} is an apocalyptic number.

It is an amenable number.

61772775671720 is an abundant number, since it is smaller than the sum of its proper divisors (77217148943800).

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

61772775671720 is a wasteful number, since it uses less digits than its factorization.

61772775671720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13103945 (or 13103941 counting only the distinct ones).

The product of its (nonzero) digits is 84707280, while the sum is 65.

The spelling of 61772775671720 in words is "sixty-one trillion, seven hundred seventy-two billion, seven hundred seventy-five million, six hundred seventy-one thousand, seven hundred twenty".