61800900511 has 16 divisors (see below), whose sum is σ = 71061465600. Its totient is φ = 52648881120.

The previous prime is 61800900503. The next prime is 61800900541. The reversal of 61800900511 is 11500900816.

It is a cyclic number.

It is not a de Polignac number, because 61800900511 - 2³ = 61800900503 is a prime.

It is a super-2 number, since 2×61800900511² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61800900541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1287240 + ... + 1334386.

It is an arithmetic number, because the mean of its divisors is an integer number (4441341600).

Almost surely, 2^61800900511 is an apocalyptic number.

61800900511 is a deficient number, since it is larger than the sum of its proper divisors (9260565089).

61800900511 is a wasteful number, since it uses less digits than its factorization.

61800900511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48294.

The product of its (nonzero) digits is 2160, while the sum is 31.

The spelling of 61800900511 in words is "sixty-one billion, eight hundred million, nine hundred thousand, five hundred eleven".