66801046770 has 24 divisors (see below), whose sum is σ = 173682721836. Its totient is φ = 17813612448.

The previous prime is 66801046769. The next prime is 66801046771. The reversal of 66801046770 is 7764010866.

It is an interprime number because it is at equal distance from previous prime (66801046769) and next prime (66801046771).

It can be written as a sum of positive squares in 2 ways, for example, as 61195380129 + 5605666641 = 247377^2 + 74871^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (66801046771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 371116837 + ... + 371117016.

Almost surely, 2^66801046770 is an apocalyptic number.

66801046770 is an abundant number, since it is smaller than the sum of its proper divisors (106881675066).

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

66801046770 is a wasteful number, since it uses less digits than its factorization.

66801046770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742233866 (or 742233863 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 66801046770 in words is "sixty-six billion, eight hundred one million, forty-six thousand, seven hundred seventy".