61699099531 has 4 divisors (see below), whose sum is σ = 61726294000. Its totient is φ = 61671905064.

The previous prime is 61699099477. The next prime is 61699099537. The reversal of 61699099531 is 13599099616.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61699099531 - 2²⁵ = 61665545099 is a prime.

It is a super-2 number, since 2×61699099531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61699099537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13593831 + ... + 13598368.

It is an arithmetic number, because the mean of its divisors is an integer number (15431573500).

Almost surely, 2^61699099531 is an apocalyptic number.

61699099531 is a deficient number, since it is larger than the sum of its proper divisors (27194469).

61699099531 is a wasteful number, since it uses less digits than its factorization.

61699099531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27194468.

The product of its (nonzero) digits is 3542940, while the sum is 58.

The spelling of 61699099531 in words is "sixty-one billion, six hundred ninety-nine million, ninety-nine thousand, five hundred thirty-one".