1625155566 has 32 divisors (see below), whose sum is σ = 3322902528. Its totient is φ = 529644000.

The previous prime is 1625155561. The next prime is 1625155573. The reversal of 1625155566 is 6655515261.

1625155566 is a nontrivial binomial coefficient, being equal to C(57012, 2).

It is a super-2 number, since 2×1625155566² = 5282261227401560712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1625155561) 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, 339691 + ... + 344441.

It is an arithmetic number, because the mean of its divisors is an integer number (103840704).

Almost surely, 2^1625155566 is an apocalyptic number.

1625155566 is the 57011-st triangular number and also the 28506-th hexagonal number.

1625155566 is an abundant number, since it is smaller than the sum of its proper divisors (1697746962).

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

1625155566 is a wasteful number, since it uses less digits than its factorization.

1625155566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6016.

The product of its digits is 270000, while the sum is 42.

The square root of 1625155566 is about 40313.2182540665. The cubic root of 1625155566 is about 1175.7048593537.

It can be divided in two parts, 16251 and 55566, that added together give a palindrome (71817).

The spelling of 1625155566 in words is "one billion, six hundred twenty-five million, one hundred fifty-five thousand, five hundred sixty-six".