61666681070 has 16 divisors (see below), whose sum is σ = 111135241728. Its totient is φ = 24636624480.

The previous prime is 61666681051. The next prime is 61666681103. The reversal of 61666681070 is 7018666616.

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, 3747374 + ... + 3763793.

It is an arithmetic number, because the mean of its divisors is an integer number (6945952608).

Almost surely, 2^61666681070 is an apocalyptic number.

61666681070 is a deficient number, since it is larger than the sum of its proper divisors (49468560658).

61666681070 is a wasteful number, since it uses less digits than its factorization.

61666681070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7511995.

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 61666681070 in words is "sixty-one billion, six hundred sixty-six million, six hundred eighty-one thousand, seventy".