7945550138 has 4 divisors (see below), whose sum is σ = 11918325210. Its totient is φ = 3972775068.

The previous prime is 7945550111. The next prime is 7945550143. The reversal of 7945550138 is 8310555497.

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

It can be written as a sum of positive squares in only one way, i.e., 7445446369 + 500103769 = 86287^2 + 22363^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7945550092 and 7945550101.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1986387533 + ... + 1986387536.

Almost surely, 2^7945550138 is an apocalyptic number.

7945550138 is a deficient number, since it is larger than the sum of its proper divisors (3972775072).

7945550138 is a wasteful number, since it uses less digits than its factorization.

7945550138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3972775071.

The product of its (nonzero) digits is 756000, while the sum is 47.

The square root of 7945550138 is about 89137.8154208415. The cubic root of 7945550138 is about 1995.4521779959.

The spelling of 7945550138 in words is "seven billion, nine hundred forty-five million, five hundred fifty thousand, one hundred thirty-eight".