61940133940 has 12 divisors (see below), whose sum is σ = 130074281316. Its totient is φ = 24776053568.

The previous prime is 61940133917. The next prime is 61940133943. The reversal of 61940133940 is 4933104916.

It can be written as a sum of positive squares in 2 ways, for example, as 18537911716 + 43402222224 = 136154^2 + 208332^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61940133893 and 61940133902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61940133943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1548503329 + ... + 1548503368.

It is an arithmetic number, because the mean of its divisors is an integer number (10839523443).

Almost surely, 2^61940133940 is an apocalyptic number.

It is an amenable number.

61940133940 is an abundant number, since it is smaller than the sum of its proper divisors (68134147376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61940133940 is a wasteful number, since it uses less digits than its factorization.

61940133940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3097006706 (or 3097006704 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 40.

The spelling of 61940133940 in words is "sixty-one billion, nine hundred forty million, one hundred thirty-three thousand, nine hundred forty".