61660511499 has 8 divisors (see below), whose sum is σ = 82216070800. Its totient is φ = 41105979936.

The previous prime is 61660511431. The next prime is 61660511567. The reversal of 61660511499 is 99411506616.

61660511499 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (61660511431) and next prime (61660511567).

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

It is not a de Polignac number, because 61660511499 - 2²³ = 61652122891 is a prime.

It is a super-2 number, since 2×61660511499² (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 (61660511999) 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, 103924 + ... + 366225.

It is an arithmetic number, because the mean of its divisors is an integer number (10277008850).

Almost surely, 2^61660511499 is an apocalyptic number.

61660511499 is a deficient number, since it is larger than the sum of its proper divisors (20555559301).

61660511499 is a wasteful number, since it uses less digits than its factorization.

61660511499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513869.

The product of its (nonzero) digits is 349920, while the sum is 48.

The spelling of 61660511499 in words is "sixty-one billion, six hundred sixty million, five hundred eleven thousand, four hundred ninety-nine".