77021357029 has 4 divisors (see below), whose sum is σ = 77024107980. Its totient is φ = 77018606080.

The previous prime is 77021357009. The next prime is 77021357041. The reversal of 77021357029 is 92075312077.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92075312077 = 7 ⋅13153616011.

It can be written as a sum of positive squares in 2 ways, for example, as 71490460129 + 5530896900 = 267377^2 + 74370^2 .

It is a cyclic number.

It is not a de Polignac number, because 77021357029 - 2¹¹ = 77021354981 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 (77021357009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1333042 + ... + 1389619.

It is an arithmetic number, because the mean of its divisors is an integer number (19256026995).

Almost surely, 2^77021357029 is an apocalyptic number.

It is an amenable number.

77021357029 is a deficient number, since it is larger than the sum of its proper divisors (2750951).

77021357029 is a wasteful number, since it uses less digits than its factorization.

77021357029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2750950.

The product of its (nonzero) digits is 185220, while the sum is 43.

The spelling of 77021357029 in words is "seventy-seven billion, twenty-one million, three hundred fifty-seven thousand, twenty-nine".