61155312021002 has 32 divisors (see below), whose sum is σ = 94075813785744. Its totient is φ = 29798385971200.

The previous prime is 61155312020993. The next prime is 61155312021019. The reversal of 61155312021002 is 20012021355116.

It can be written as a sum of positive squares in 8 ways, for example, as 28145794278121 + 33009517742881 = 5305261^2 + 5745391^2 .

It is a super-2 number, since 2×61155312021002² (a number of 28 digits) contains 22 as substring.

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, 1801795352 + ... + 1801829292.

Almost surely, 2^{61155312021002} is an apocalyptic number.

61155312021002 is a deficient number, since it is larger than the sum of its proper divisors (32920501764742).

61155312021002 is a wasteful number, since it uses less digits than its factorization.

61155312021002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57994.

The product of its (nonzero) digits is 3600, while the sum is 29.

Adding to 61155312021002 its reverse (20012021355116), we get a palindrome (81167333376118).

The spelling of 61155312021002 in words is "sixty-one trillion, one hundred fifty-five billion, three hundred twelve million, twenty-one thousand, two".