60561661615666 has 4 divisors (see below), whose sum is σ = 90842492423502. Its totient is φ = 30280830807832.

The previous prime is 60561661615577. The next prime is 60561661615687. The reversal of 60561661615666 is 66651616616506.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 34288297295641 + 26273364320025 = 5855621^2 + 5125755^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15140415403915 + ... + 15140415403918.

Almost surely, 2^{60561661615666} is an apocalyptic number.

60561661615666 is a deficient number, since it is larger than the sum of its proper divisors (30280830807836).

60561661615666 is a wasteful number, since it uses less digits than its factorization.

60561661615666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30280830807835.

The product of its (nonzero) digits is 41990400, while the sum is 61.

The spelling of 60561661615666 in words is "sixty trillion, five hundred sixty-one billion, six hundred sixty-one million, six hundred fifteen thousand, six hundred sixty-six".