61539148881 has 12 divisors (see below), whose sum is σ = 101588436352. Its totient is φ = 35165227896.

The previous prime is 61539148831. The next prime is 61539148889. The reversal of 61539148881 is 18884193516.

It is a happy number.

61539148881 is a `hidden beast` number, since 6 + 153 + 9 + 1 + 488 + 8 + 1 = 666.

It is not a de Polignac number, because 61539148881 - 2⁹ = 61539148369 is a prime.

It is a super-2 number, since 2×61539148881² (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 (61539148889) 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, 488405881 + ... + 488406006.

Almost surely, 2^61539148881 is an apocalyptic number.

It is an amenable number.

61539148881 is a deficient number, since it is larger than the sum of its proper divisors (40049287471).

61539148881 is a wasteful number, since it uses less digits than its factorization.

61539148881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976811900 (or 976811897 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 54.

The spelling of 61539148881 in words is "sixty-one billion, five hundred thirty-nine million, one hundred forty-eight thousand, eight hundred eighty-one".