61735071981 has 16 divisors (see below), whose sum is σ = 89859640320. Its totient is φ = 37388873520.

The previous prime is 61735071929. The next prime is 61735072001. The reversal of 61735071981 is 18917053716.

It is not a de Polignac number, because 61735071981 - 2⁹ = 61735071469 is a prime.

It is a super-2 number, since 2×61735071981² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61735071981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61735070981) 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, 610371 + ... + 704288.

It is an arithmetic number, because the mean of its divisors is an integer number (5616227520).

Almost surely, 2^61735071981 is an apocalyptic number.

It is an amenable number.

61735071981 is a deficient number, since it is larger than the sum of its proper divisors (28124568339).

61735071981 is a wasteful number, since it uses less digits than its factorization.

61735071981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316096.

The product of its (nonzero) digits is 317520, while the sum is 48.

The spelling of 61735071981 in words is "sixty-one billion, seven hundred thirty-five million, seventy-one thousand, nine hundred eighty-one".