3965620551 has 4 divisors (see below), whose sum is σ = 5287494072. Its totient is φ = 2643747032.

The previous prime is 3965620507. The next prime is 3965620567. The reversal of 3965620551 is 1550265693.

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

It is a cyclic number.

It is not a de Polignac number, because 3965620551 - 2⁷ = 3965620423 is a prime.

It is a super-2 number, since 2×3965620551² = 31452292709027087202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3965628551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 660936756 + ... + 660936761.

It is an arithmetic number, because the mean of its divisors is an integer number (1321873518).

Almost surely, 2^3965620551 is an apocalyptic number.

3965620551 is a deficient number, since it is larger than the sum of its proper divisors (1321873521).

3965620551 is a wasteful number, since it uses less digits than its factorization.

3965620551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321873520.

The product of its (nonzero) digits is 243000, while the sum is 42.

The square root of 3965620551 is about 62973.1732644941. The cubic root of 3965620551 is about 1582.8401289423.

The spelling of 3965620551 in words is "three billion, nine hundred sixty-five million, six hundred twenty thousand, five hundred fifty-one".