61640824642 has 48 divisors (see below), whose sum is σ = 98704182528. Its totient is φ = 28860337440.

The previous prime is 61640824589. The next prime is 61640824657. The reversal of 61640824642 is 24642804616.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14389833 + ... + 14394115.

It is an arithmetic number, because the mean of its divisors is an integer number (2056337136).

Almost surely, 2^61640824642 is an apocalyptic number.

61640824642 is a deficient number, since it is larger than the sum of its proper divisors (37063357886).

61640824642 is a wasteful number, since it uses less digits than its factorization.

61640824642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4615 (or 4592 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 43.

The spelling of 61640824642 in words is "sixty-one billion, six hundred forty million, eight hundred twenty-four thousand, six hundred forty-two".