77373661 has 4 divisors (see below), whose sum is σ = 77412924. Its totient is φ = 77334400.

The previous prime is 77373619. The next prime is 77373671. The reversal of 77373661 is 16637377.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16637377 = 1531 ⋅10867.

It can be written as a sum of positive squares in 2 ways, for example, as 26522500 + 50851161 = 5150^2 + 7131^2 .

It is a cyclic number.

It is not a de Polignac number, because 77373661 - 2⁷ = 77373533 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 (77373671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16510 + ... + 20671.

It is an arithmetic number, because the mean of its divisors is an integer number (19353231).

Almost surely, 2^77373661 is an apocalyptic number.

It is an amenable number.

77373661 is a deficient number, since it is larger than the sum of its proper divisors (39263).

77373661 is a wasteful number, since it uses less digits than its factorization.

77373661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39262.

The product of its digits is 111132, while the sum is 40.

The square root of 77373661 is about 8796.2299310557. The cubic root of 77373661 is about 426.1191468034.

The spelling of 77373661 in words is "seventy-seven million, three hundred seventy-three thousand, six hundred sixty-one".