7642171505 has 4 divisors (see below), whose sum is σ = 9170605812. Its totient is φ = 6113737200.

The previous prime is 7642171451. The next prime is 7642171519. The reversal of 7642171505 is 5051712467.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5051712467 = 419 ⋅12056593.

It can be written as a sum of positive squares in 2 ways, for example, as 5734578529 + 1907592976 = 75727^2 + 43676^2 .

It is not a de Polignac number, because 7642171505 - 2¹² = 7642167409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 764217146 + ... + 764217155.

It is an arithmetic number, because the mean of its divisors is an integer number (2292651453).

Almost surely, 2^7642171505 is an apocalyptic number.

It is an amenable number.

7642171505 is a deficient number, since it is larger than the sum of its proper divisors (1528434307).

7642171505 is a wasteful number, since it uses less digits than its factorization.

7642171505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528434306.

The product of its (nonzero) digits is 58800, while the sum is 38.

The square root of 7642171505 is about 87419.5144404269. The cubic root of 7642171505 is about 1969.7249828666.

The spelling of 7642171505 in words is "seven billion, six hundred forty-two million, one hundred seventy-one thousand, five hundred five".