61557709480 has 16 divisors (see below), whose sum is σ = 138504846420. Its totient is φ = 24623083776.

The previous prime is 61557709469. The next prime is 61557709541. The reversal of 61557709480 is 8490775516.

It can be written as a sum of positive squares in 2 ways, for example, as 61526818116 + 30891364 = 248046^2 + 5558^2 .

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, 769471329 + ... + 769471408.

Almost surely, 2^61557709480 is an apocalyptic number.

It is an amenable number.

61557709480 is an abundant number, since it is smaller than the sum of its proper divisors (76947136940).

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

61557709480 is a wasteful number, since it uses less digits than its factorization.

61557709480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1538942748 (or 1538942744 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 52.

The spelling of 61557709480 in words is "sixty-one billion, five hundred fifty-seven million, seven hundred nine thousand, four hundred eighty".