61731177320 has 16 divisors (see below), whose sum is σ = 138895149060. Its totient is φ = 24692470912.

The previous prime is 61731177317. The next prime is 61731177341. The reversal of 61731177320 is 2377113716.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 61655869636 + 75307684 = 248306^2 + 8678^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 771639677 + ... + 771639756.

Almost surely, 2^61731177320 is an apocalyptic number.

It is an amenable number.

61731177320 is an abundant number, since it is smaller than the sum of its proper divisors (77163971740).

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

61731177320 is a wasteful number, since it uses less digits than its factorization.

61731177320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543279444 (or 1543279440 counting only the distinct ones).

The product of its (nonzero) digits is 37044, while the sum is 38.

The spelling of 61731177320 in words is "sixty-one billion, seven hundred thirty-one million, one hundred seventy-seven thousand, three hundred twenty".