61691930511 has 8 divisors (see below), whose sum is σ = 82257229824. Its totient is φ = 41127292440.

The previous prime is 61691930491. The next prime is 61691930533. The reversal of 61691930511 is 11503919616.

61691930511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61691930511 - 2²² = 61687736207 is a prime.

It is a super-2 number, since 2×61691930511² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61691930611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125440 + ... + 372986.

It is an arithmetic number, because the mean of its divisors is an integer number (10282153728).

Almost surely, 2^61691930511 is an apocalyptic number.

61691930511 is a deficient number, since it is larger than the sum of its proper divisors (20565299313).

61691930511 is a wasteful number, since it uses less digits than its factorization.

61691930511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330621.

The product of its (nonzero) digits is 43740, while the sum is 42.

The spelling of 61691930511 in words is "sixty-one billion, six hundred ninety-one million, nine hundred thirty thousand, five hundred eleven".