66770780734 has 16 divisors (see below), whose sum is σ = 114475281408. Its totient is φ = 28613277432.

The previous prime is 66770780693. The next prime is 66770780749. The reversal of 66770780734 is 43708707766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77734 + ... + 373609.

It is an arithmetic number, because the mean of its divisors is an integer number (7154705088).

Almost surely, 2^66770780734 is an apocalyptic number.

66770780734 is a deficient number, since it is larger than the sum of its proper divisors (47704500674).

66770780734 is a wasteful number, since it uses less digits than its factorization.

66770780734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461919.

The product of its (nonzero) digits is 8297856, while the sum is 55.

The spelling of 66770780734 in words is "sixty-six billion, seven hundred seventy million, seven hundred eighty thousand, seven hundred thirty-four".