7642545081 has 16 divisors (see below), whose sum is σ = 10278812544. Its totient is φ = 5050819584.

The previous prime is 7642545061. The next prime is 7642545091. The reversal of 7642545081 is 1805452467.

It is a happy number.

It is not a de Polignac number, because 7642545081 - 2⁵ = 7642545049 is a prime.

It is a super-2 number, since 2×7642545081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7642545061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166425 + ... + 207321.

It is an arithmetic number, because the mean of its divisors is an integer number (642425784).

Almost surely, 2^7642545081 is an apocalyptic number.

It is an amenable number.

7642545081 is a deficient number, since it is larger than the sum of its proper divisors (2636267463).

7642545081 is a wasteful number, since it uses less digits than its factorization.

7642545081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41440.

The product of its (nonzero) digits is 268800, while the sum is 42.

The square root of 7642545081 is about 87421.6510997133. The cubic root of 7642545081 is about 1969.7570780196.

The spelling of 7642545081 in words is "seven billion, six hundred forty-two million, five hundred forty-five thousand, eighty-one".