61506166516 has 6 divisors (see below), whose sum is σ = 107635791410. Its totient is φ = 30753083256.

The previous prime is 61506166511. The next prime is 61506166517. The reversal of 61506166516 is 61566160516.

It can be written as a sum of positive squares in only one way, i.e., 61182022500 + 324144016 = 247350^2 + 18004^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61506166511) by changing a digit.

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 as a sum of consecutive naturals, namely, 7688270811 + ... + 7688270818.

Almost surely, 2^61506166516 is an apocalyptic number.

It is an amenable number.

61506166516 is a deficient number, since it is larger than the sum of its proper divisors (46129624894).

61506166516 is a wasteful number, since it uses less digits than its factorization.

61506166516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15376541633 (or 15376541631 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 61506166516 in words is "sixty-one billion, five hundred six million, one hundred sixty-six thousand, five hundred sixteen".