61866015555806 has 32 divisors (see below), whose sum is σ = 115697916967680. Its totient is φ = 24103552147200.

The previous prime is 61866015555713. The next prime is 61866015555821. The reversal of 61866015555806 is 60855551066816.

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, 52865525 + ... + 54023103.

It is an arithmetic number, because the mean of its divisors is an integer number (3615559905240).

Almost surely, 2^{61866015555806} is an apocalyptic number.

61866015555806 is a deficient number, since it is larger than the sum of its proper divisors (53831901411874).

61866015555806 is a wasteful number, since it uses less digits than its factorization.

61866015555806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504640.

The product of its (nonzero) digits is 51840000, while the sum is 62.

The spelling of 61866015555806 in words is "sixty-one trillion, eight hundred sixty-six billion, fifteen million, five hundred fifty-five thousand, eight hundred six".