61690749652 has 24 divisors (see below), whose sum is σ = 124868028096. Its totient is φ = 26120350848.

The previous prime is 61690749623. The next prime is 61690749667. The reversal of 61690749652 is 25694709616.

It is a happy number.

It is a super-2 number, since 2×61690749652² (a number of 22 digits) contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 61690749593 and 61690749602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13270213 + ... + 13274860.

It is an arithmetic number, because the mean of its divisors is an integer number (5202834504).

Almost surely, 2^61690749652 is an apocalyptic number.

It is an amenable number.

61690749652 is an abundant number, since it is smaller than the sum of its proper divisors (63177278444).

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

61690749652 is a wasteful number, since it uses less digits than its factorization.

61690749652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26545167 (or 26545165 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 55.

The spelling of 61690749652 in words is "sixty-one billion, six hundred ninety million, seven hundred forty-nine thousand, six hundred fifty-two".