61671508390 has 16 divisors (see below), whose sum is σ = 115835181408. Its totient is φ = 23596055296.

The previous prime is 61671508369. The next prime is 61671508421. The reversal of 61671508390 is 9380517616.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a self number, because there is not a number n which added to its sum of digits gives 61671508390.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134068267 + ... + 134068726.

It is an arithmetic number, because the mean of its divisors is an integer number (7239698838).

Almost surely, 2^61671508390 is an apocalyptic number.

61671508390 is a deficient number, since it is larger than the sum of its proper divisors (54163673018).

61671508390 is a wasteful number, since it uses less digits than its factorization.

61671508390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268137023.

The product of its (nonzero) digits is 272160, while the sum is 46.

The spelling of 61671508390 in words is "sixty-one billion, six hundred seventy-one million, five hundred eight thousand, three hundred ninety".