77653007242 has 4 divisors (see below), whose sum is σ = 116479510866. Its totient is φ = 38826503620.

The previous prime is 77653007233. The next prime is 77653007291. The reversal of 77653007242 is 24270035677.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24270035677 = 1051 ⋅23092327.

It can be written as a sum of positive squares in only one way, i.e., 57845541121 + 19807466121 = 240511^2 + 140739^2 .

It is a super-2 number, since 2×77653007242² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19413251809 + ... + 19413251812.

Almost surely, 2^77653007242 is an apocalyptic number.

77653007242 is a deficient number, since it is larger than the sum of its proper divisors (38826503624).

77653007242 is a wasteful number, since it uses less digits than its factorization.

77653007242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38826503623.

The product of its (nonzero) digits is 493920, while the sum is 43.

The spelling of 77653007242 in words is "seventy-seven billion, six hundred fifty-three million, seven thousand, two hundred forty-two".