61841987378361 has 24 divisors (see below), whose sum is σ = 94617380707200. Its totient is φ = 38788244263296.

The previous prime is 61841987378351. The next prime is 61841987378371. The reversal of 61841987378361 is 16387378914816.

61841987378361 is a `hidden beast` number, since 6 + 1 + 8 + 4 + 198 + 7 + 3 + 78 + 361 = 666.

It is an interprime number because it is at equal distance from previous prime (61841987378351) and next prime (61841987378371).

It is not a de Polignac number, because 61841987378361 - 2¹⁰ = 61841987377337 is a prime.

It is a super-2 number, since 2×61841987378361² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61841987378361.

It is not an unprimeable number, because it can be changed into a prime (61841987378351) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75483661 + ... + 76298538.

It is an arithmetic number, because the mean of its divisors is an integer number (3942390862800).

Almost surely, 2^{61841987378361} is an apocalyptic number.

It is an amenable number.

61841987378361 is a deficient number, since it is larger than the sum of its proper divisors (32775393328839).

61841987378361 is a wasteful number, since it uses less digits than its factorization.

61841987378361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151784885 (or 151784882 counting only the distinct ones).

The product of its digits is 292626432, while the sum is 72.

The spelling of 61841987378361 in words is "sixty-one trillion, eight hundred forty-one billion, nine hundred eighty-seven million, three hundred seventy-eight thousand, three hundred sixty-one".