77747740438005 has 36 divisors (see below), whose sum is σ = 148127650938540. Its totient is φ = 37695874149120.

The previous prime is 77747740437989. The next prime is 77747740438021. The reversal of 77747740438005 is 50083404774777.

It is a happy number.

77747740438005 is a `hidden beast` number, since 7 + 7 + 7 + 477 + 40 + 43 + 80 + 0 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (77747740437989) and next prime (77747740438021).

It can be written as a sum of positive squares in 2 ways, for example, as 10563390518769 + 67184349919236 = 3250137^2 + 8196606^2 .

It is not a de Polignac number, because 77747740438005 - 2⁴ = 77747740437989 is a prime.

It is a super-2 number, since 2×77747740438005² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7139364660 + ... + 7139375549.

It is an arithmetic number, because the mean of its divisors is an integer number (4114656970515).

Almost surely, 2^{77747740438005} is an apocalyptic number.

It is an amenable number.

77747740438005 is a deficient number, since it is larger than the sum of its proper divisors (70379910500535).

77747740438005 is a wasteful number, since it uses less digits than its factorization.

77747740438005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14278740242 (or 14278740228 counting only the distinct ones).

The product of its (nonzero) digits is 129077760, while the sum is 63.

The spelling of 77747740438005 in words is "seventy-seven trillion, seven hundred forty-seven billion, seven hundred forty million, four hundred thirty-eight thousand, five".