77154621251 has 4 divisors (see below), whose sum is σ = 77182507872. Its totient is φ = 77126734632.

The previous prime is 77154621233. The next prime is 77154621259. The reversal of 77154621251 is 15212645177.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77154621251 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77154621199 and 77154621208.

It is not an unprimeable number, because it can be changed into a prime (77154621259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13939160 + ... + 13944693.

It is an arithmetic number, because the mean of its divisors is an integer number (19295626968).

Almost surely, 2^77154621251 is an apocalyptic number.

77154621251 is a deficient number, since it is larger than the sum of its proper divisors (27886621).

77154621251 is a wasteful number, since it uses less digits than its factorization.

77154621251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27886620.

The product of its digits is 117600, while the sum is 41.

The spelling of 77154621251 in words is "seventy-seven billion, one hundred fifty-four million, six hundred twenty-one thousand, two hundred fifty-one".