61668377660 has 48 divisors (see below), whose sum is σ = 131845432320. Its totient is φ = 24222219840.

The previous prime is 61668377657. The next prime is 61668377663. The reversal of 61668377660 is 6677386616.

It is an interprime number because it is at equal distance from previous prime (61668377657) and next prime (61668377663).

It is a junction number, because it is equal to n+sod(n) for n = 61668377596 and 61668377605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61668377663) 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 in 15 ways as a sum of consecutive naturals, for example, 1046297 + ... + 1103663.

It is an arithmetic number, because the mean of its divisors is an integer number (2746779840).

Almost surely, 2^61668377660 is an apocalyptic number.

It is an amenable number.

61668377660 is an abundant number, since it is smaller than the sum of its proper divisors (70177054660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61668377660 is a wasteful number, since it uses less digits than its factorization.

61668377660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58346 (or 58344 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 56.

The spelling of 61668377660 in words is "sixty-one billion, six hundred sixty-eight million, three hundred seventy-seven thousand, six hundred sixty".