61642538970 has 64 divisors (see below), whose sum is σ = 155015334144. Its totient is φ = 15658030080.

The previous prime is 61642538959. The next prime is 61642538977. The reversal of 61642538970 is 7983524616.

It is a super-2 number, since 2×61642538970² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61642538977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19057 + ... + 351636.

It is an arithmetic number, because the mean of its divisors is an integer number (2422114596).

It is a 1-persistent number, because it is pandigital, but 2⋅61642538970 = 123285077940 is not.

Almost surely, 2^61642538970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61642538970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77507667072).

61642538970 is an abundant number, since it is smaller than the sum of its proper divisors (93372795174).

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

61642538970 is a wasteful number, since it uses less digits than its factorization.

61642538970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370967.

The product of its (nonzero) digits is 2177280, while the sum is 51.

The spelling of 61642538970 in words is "sixty-one billion, six hundred forty-two million, five hundred thirty-eight thousand, nine hundred seventy".