77735151132421 has 8 divisors (see below), whose sum is σ = 77958370539000. Its totient is φ = 77511934484160.

The previous prime is 77735151132361. The next prime is 77735151132481. The reversal of 77735151132421 is 12423115153777.

It is an interprime number because it is at equal distance from previous prime (77735151132361) and next prime (77735151132481).

It can be written as a sum of positive squares in 4 ways, for example, as 14994320062500 + 62740831069921 = 3872250^2 + 7920911^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77735151132421 - 2¹⁹ = 77735150608133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77735151132481) 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, 64621311 + ... + 65813251.

It is an arithmetic number, because the mean of its divisors is an integer number (9744796317375).

Almost surely, 2^{77735151132421} is an apocalyptic number.

It is an amenable number.

77735151132421 is a deficient number, since it is larger than the sum of its proper divisors (223219406579).

77735151132421 is a wasteful number, since it uses less digits than its factorization.

77735151132421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379159.

The product of its digits is 1234800, while the sum is 49.

The spelling of 77735151132421 in words is "seventy-seven trillion, seven hundred thirty-five billion, one hundred fifty-one million, one hundred thirty-two thousand, four hundred twenty-one".