61721164270 has 32 divisors (see below), whose sum is σ = 117645696000. Its totient is φ = 23249006496.

The previous prime is 61721164249. The next prime is 61721164301. The reversal of 61721164270 is 7246112716.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 940870 + ... + 1004329.

It is an arithmetic number, because the mean of its divisors is an integer number (3676428000).

Almost surely, 2^61721164270 is an apocalyptic number.

61721164270 is a deficient number, since it is larger than the sum of its proper divisors (55924531730).

61721164270 is a wasteful number, since it uses less digits than its factorization.

61721164270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1945392.

The product of its (nonzero) digits is 28224, while the sum is 37.

Adding to 61721164270 its reverse (7246112716), we get a palindrome (68967276986).

The spelling of 61721164270 in words is "sixty-one billion, seven hundred twenty-one million, one hundred sixty-four thousand, two hundred seventy".