61620020715 has 64 divisors (see below), whose sum is σ = 114337267200. Its totient is φ = 28023552000.

The previous prime is 61620020711. The next prime is 61620020723. The reversal of 61620020715 is 51702002616.

It is not a de Polignac number, because 61620020715 - 2² = 61620020711 is a prime.

It is a super-2 number, since 2×61620020715² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61620020711) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 219331 + ... + 413939.

It is an arithmetic number, because the mean of its divisors is an integer number (1786519800).

Almost surely, 2^61620020715 is an apocalyptic number.

61620020715 is a deficient number, since it is larger than the sum of its proper divisors (52717246485).

61620020715 is a wasteful number, since it uses less digits than its factorization.

61620020715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194748.

The product of its (nonzero) digits is 5040, while the sum is 30.

The spelling of 61620020715 in words is "sixty-one billion, six hundred twenty million, twenty thousand, seven hundred fifteen".