61222536540 has 144 divisors (see below), whose sum is σ = 205912508256. Its totient is φ = 14598489600.

The previous prime is 61222536539. The next prime is 61222536569. The reversal of 61222536540 is 4563522216.

61222536540 is a `hidden beast` number, since 61 + 2 + 2 + 2 + 53 + 6 + 540 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 61222536495 and 61222536504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 132667 + ... + 374226.

It is an arithmetic number, because the mean of its divisors is an integer number (1429947974).

Almost surely, 2^61222536540 is an apocalyptic number.

61222536540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61222536540 is an abundant number, since it is smaller than the sum of its proper divisors (144689971716).

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

61222536540 is a wasteful number, since it uses less digits than its factorization.

61222536540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506980 (or 506975 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 61222536540 in words is "sixty-one billion, two hundred twenty-two million, five hundred thirty-six thousand, five hundred forty".