77070660752781 has 12 divisors (see below), whose sum is σ = 111325243296540. Its totient is φ = 51379999482240.

The previous prime is 77070660752779. The next prime is 77070660752797. The reversal of 77070660752781 is 18725706607077.

It can be written as a sum of positive squares in 2 ways, for example, as 74343902088681 + 2726758664100 = 8622291^2 + 1651290^2 .

It is not a de Polignac number, because 77070660752781 - 2¹ = 77070660752779 is a prime.

It is a super-2 number, since 2×77070660752781² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77070660752581) 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, 35643090 + ... + 37743491.

It is an arithmetic number, because the mean of its divisors is an integer number (9277103608045).

Almost surely, 2^{77070660752781} is an apocalyptic number.

It is an amenable number.

77070660752781 is a deficient number, since it is larger than the sum of its proper divisors (34254582543759).

77070660752781 is a wasteful number, since it uses less digits than its factorization.

77070660752781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73503276 (or 73503273 counting only the distinct ones).

The product of its (nonzero) digits is 48404160, while the sum is 63.

The spelling of 77070660752781 in words is "seventy-seven trillion, seventy billion, six hundred sixty million, seven hundred fifty-two thousand, seven hundred eighty-one".