63777997 has 4 divisors (see below), whose sum is σ = 64859040. Its totient is φ = 62696956.

The previous prime is 63777979. The next prime is 63778009. The reversal of 63777997 is 79977736.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63777997 - 2¹⁹ = 63253709 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 (63777937) 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, 540433 + ... + 540550.

It is an arithmetic number, because the mean of its divisors is an integer number (16214760).

Almost surely, 2^63777997 is an apocalyptic number.

It is an amenable number.

63777997 is a deficient number, since it is larger than the sum of its proper divisors (1081043).

63777997 is a wasteful number, since it uses less digits than its factorization.

63777997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081042.

The product of its digits is 3500658, while the sum is 55.

The square root of 63777997 is about 7986.1127590336. The cubic root of 63777997 is about 399.5369579370.

It can be divided in two parts, 6377799 and 7, that added together give a triangular number (6377806 = T₃₅₇₁).

The spelling of 63777997 in words is "sixty-three million, seven hundred seventy-seven thousand, nine hundred ninety-seven".