7638745501 has 4 divisors (see below), whose sum is σ = 7644077532. Its totient is φ = 7633413472.

The previous prime is 7638745451. The next prime is 7638745519. The reversal of 7638745501 is 1055478367.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1055478367 = 19 ⋅55551493.

It can be written as a sum of positive squares in 2 ways, for example, as 5689081476 + 1949664025 = 75426^2 + 44155^2 .

It is a cyclic number.

It is not a de Polignac number, because 7638745501 - 2⁹ = 7638744989 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 (7638745531) 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, 2663866 + ... + 2666731.

It is an arithmetic number, because the mean of its divisors is an integer number (1911019383).

Almost surely, 2^7638745501 is an apocalyptic number.

It is an amenable number.

7638745501 is a deficient number, since it is larger than the sum of its proper divisors (5332031).

7638745501 is a wasteful number, since it uses less digits than its factorization.

7638745501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5332030.

The product of its (nonzero) digits is 705600, while the sum is 46.

The square root of 7638745501 is about 87399.9170537364. The cubic root of 7638745501 is about 1969.4305947100.

The spelling of 7638745501 in words is "seven billion, six hundred thirty-eight million, seven hundred forty-five thousand, five hundred one".