61971954280 has 32 divisors (see below), whose sum is σ = 142837800840. Its totient is φ = 24184176640.

The previous prime is 61971954263. The next prime is 61971954281. The reversal of 61971954280 is 8245917916.

It can be written as a sum of positive squares in 4 ways, for example, as 43968218596 + 18003735684 = 209686^2 + 134178^2 .

It is not an unprimeable number, because it can be changed into a prime (61971954281) 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, 18892249 + ... + 18895528.

Almost surely, 2^61971954280 is an apocalyptic number.

It is an amenable number.

61971954280 is an abundant number, since it is smaller than the sum of its proper divisors (80865846560).

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

61971954280 is a wasteful number, since it uses less digits than its factorization.

61971954280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37787829 (or 37787825 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 61971954280 in words is "sixty-one billion, nine hundred seventy-one million, nine hundred fifty-four thousand, two hundred eighty".