7513121643 has 8 divisors (see below), whose sum is σ = 10116679056. Its totient is φ = 4959156000.

The previous prime is 7513121621. The next prime is 7513121647. The reversal of 7513121643 is 3461213157.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7513121643 - 2¹³ = 7513113451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7513121647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12397588 + ... + 12398193.

It is an arithmetic number, because the mean of its divisors is an integer number (1264584882).

Almost surely, 2^7513121643 is an apocalyptic number.

7513121643 is a deficient number, since it is larger than the sum of its proper divisors (2603557413).

7513121643 is a wasteful number, since it uses less digits than its factorization.

7513121643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24795885.

The product of its digits is 15120, while the sum is 33.

The square root of 7513121643 is about 86678.2651130028. The cubic root of 7513121643 is about 1958.5746998464.

The spelling of 7513121643 in words is "seven billion, five hundred thirteen million, one hundred twenty-one thousand, six hundred forty-three".