77761378381412 has 24 divisors (see below), whose sum is σ = 154908042311232. Its totient is φ = 33809294948000.

The previous prime is 77761378381411. The next prime is 77761378381439. The reversal of 77761378381412 is 21418387316777.

It is a super-2 number, since 2×77761378381412² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77761378381411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38419652339 + ... + 38419654362.

It is an arithmetic number, because the mean of its divisors is an integer number (6454501762968).

Almost surely, 2^{77761378381412} is an apocalyptic number.

It is an amenable number.

77761378381412 is a deficient number, since it is larger than the sum of its proper divisors (77146663929820).

77761378381412 is a wasteful number, since it uses less digits than its factorization.

77761378381412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76839306739 (or 76839306737 counting only the distinct ones).

The product of its digits is 66382848, while the sum is 65.

The spelling of 77761378381412 in words is "seventy-seven trillion, seven hundred sixty-one billion, three hundred seventy-eight million, three hundred eighty-one thousand, four hundred twelve".