61803708520 has 32 divisors (see below), whose sum is σ = 140073381000. Its totient is φ = 24541032448.

The previous prime is 61803708479. The next prime is 61803708553. The reversal of 61803708520 is 2580730816.

It can be written as a sum of positive squares in 4 ways, for example, as 60881614564 + 922093956 = 246742^2 + 30366^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5633545 + ... + 5644504.

Almost surely, 2^61803708520 is an apocalyptic number.

It is an amenable number.

61803708520 is an abundant number, since it is smaller than the sum of its proper divisors (78269672480).

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

61803708520 is a wasteful number, since it uses less digits than its factorization.

61803708520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11278197 (or 11278193 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 61803708520 in words is "sixty-one billion, eight hundred three million, seven hundred eight thousand, five hundred twenty".