55553779 has 2 divisors, whose sum is σ = 55553780. Its totient is φ = 55553778.

The previous prime is 55553759. The next prime is 55553783. The reversal of 55553779 is 97735555.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55553779 - 2¹¹ = 55551731 is a prime.

It is a super-2 number, since 2×55553779² = 6172444722361682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55553759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27776889 + 27776890.

It is an arithmetic number, because the mean of its divisors is an integer number (27776890).

Almost surely, 2^55553779 is an apocalyptic number.

55553779 is a deficient number, since it is larger than the sum of its proper divisors (1).

55553779 is an equidigital number, since it uses as much as digits as its factorization.

55553779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 826875, while the sum is 46.

The square root of 55553779 is about 7453.4407490769. The cubic root of 55553779 is about 381.5673468442.

The spelling of 55553779 in words is "fifty-five million, five hundred fifty-three thousand, seven hundred seventy-nine".