61401455181 has 24 divisors (see below), whose sum is σ = 96761736864. Its totient is φ = 37209953760.

The previous prime is 61401455177. The next prime is 61401455189. The reversal of 61401455181 is 18155410416.

61401455181 is a `hidden beast` number, since 6 + 14 + 0 + 14 + 551 + 81 = 666.

It is not a de Polignac number, because 61401455181 - 2² = 61401455177 is a prime.

It is a super-2 number, since 2×61401455181² (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 (61401455189) 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, 2000110 + ... + 2030576.

It is an arithmetic number, because the mean of its divisors is an integer number (4031739036).

Almost surely, 2^61401455181 is an apocalyptic number.

It is an amenable number.

61401455181 is a deficient number, since it is larger than the sum of its proper divisors (35360281683).

61401455181 is a wasteful number, since it uses less digits than its factorization.

61401455181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50841 (or 50838 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

Adding to 61401455181 its reverse (18155410416), we get a palindrome (79556865597).

The spelling of 61401455181 in words is "sixty-one billion, four hundred one million, four hundred fifty-five thousand, one hundred eighty-one".