61318223919 has 12 divisors (see below), whose sum is σ = 88950902976. Its totient is φ = 40703368992.

The previous prime is 61318223893. The next prime is 61318223921. The reversal of 61318223919 is 91932281316.

It is a happy number.

61318223919 is a `hidden beast` number, since 613 + 1 + 8 + 2 + 23 + 9 + 1 + 9 = 666.

It is not a de Polignac number, because 61318223919 - 2¹³ = 61318215727 is a prime.

It is a super-2 number, since 2×61318223919² (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 (61318223719) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14618367 + ... + 14622560.

It is an arithmetic number, because the mean of its divisors is an integer number (7412575248).

Almost surely, 2^61318223919 is an apocalyptic number.

61318223919 is a deficient number, since it is larger than the sum of its proper divisors (27632679057).

61318223919 is a wasteful number, since it uses less digits than its factorization.

61318223919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29241166 (or 29241163 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The spelling of 61318223919 in words is "sixty-one billion, three hundred eighteen million, two hundred twenty-three thousand, nine hundred nineteen".