61144614940 has 24 divisors (see below), whose sum is σ = 130826404800. Its totient is φ = 23996376768.

The previous prime is 61144614919. The next prime is 61144614959. The reversal of 61144614940 is 4941644116.

It is a junction number, because it is equal to n+sod(n) for n = 61144614893 and 61144614902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28840740 + ... + 28842859.

It is an arithmetic number, because the mean of its divisors is an integer number (5451100200).

Almost surely, 2^61144614940 is an apocalyptic number.

It is an amenable number.

61144614940 is an abundant number, since it is smaller than the sum of its proper divisors (69681789860).

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

61144614940 is a wasteful number, since it uses less digits than its factorization.

61144614940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57683661 (or 57683659 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 61144614940 in words is "sixty-one billion, one hundred forty-four million, six hundred fourteen thousand, nine hundred forty".