551657993890 has 16 divisors (see below), whose sum is σ = 993569560632. Its totient is φ = 220533159424.

The previous prime is 551657993819. The next prime is 551657993891. The reversal of 551657993890 is 98399756155.

It can be written as a sum of positive squares in 4 ways, for example, as 539242017561 + 12415976329 = 734331^2 + 111427^2 .

It is not an unprimeable number, because it can be changed into a prime (551657993891) 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, 16236949 + ... + 16270888.

Almost surely, 2^551657993890 is an apocalyptic number.

551657993890 is a deficient number, since it is larger than the sum of its proper divisors (441911566742).

551657993890 is a wasteful number, since it uses less digits than its factorization.

551657993890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32509541.

The product of its (nonzero) digits is 91854000, while the sum is 67.

The spelling of 551657993890 in words is "five hundred fifty-one billion, six hundred fifty-seven million, nine hundred ninety-three thousand, eight hundred ninety".