7427555645820 has 48 divisors (see below), whose sum is σ = 21468031807488. Its totient is φ = 1916788553280.

The previous prime is 7427555645819. The next prime is 7427555645857. The reversal of 7427555645820 is 285465557247.

It is a happy number.

It is a super-6 number, since 6×7427555645820⁶ (a number of 79 digits) contains 666666 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1996652884 + ... + 1996656603.

It is an arithmetic number, because the mean of its divisors is an integer number (447250662656).

Almost surely, 2^{7427555645820} is an apocalyptic number.

It is an amenable number.

7427555645820 is an abundant number, since it is smaller than the sum of its proper divisors (14040476161668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7427555645820 is a wasteful number, since it uses less digits than its factorization.

7427555645820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3993309530 (or 3993309528 counting only the distinct ones).

The product of its (nonzero) digits is 94080000, while the sum is 60.

The spelling of 7427555645820 in words is "seven trillion, four hundred twenty-seven billion, five hundred fifty-five million, six hundred forty-five thousand, eight hundred twenty".